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an approach to the airfield in weather conditions below required minima, the failure of the crew to timely take the decision to go-around and the descent below minimum descent altitude despite absence of reliable visual contact with the approach lights and runway lights, which led to the collision of the airplane with trees and ground in controlled flight.

Contributing factors were:
- unjustified weather forecasts regarding cloud ceiling, visibility and severe weather (fog)
- inaccurate weather observation reports passed to the crew 40 minutes prior to impact

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